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Fair Value Measurements Fair Value Tables of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement |  | $ 36 | $ 72 | $ 157
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement |  | 48 | 21 | 35
Commodity Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement |  |  |  | 4
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-term Debt, Fair Value |  | 117 | 5,775 | 9,425
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash Equivalents and Restricted Cash Equivalents | [1] | 1,389 | 1,221 | 1,307
Marketable Securities |  | 6 | 5 | 49
Assets at Fair Value |  | 1,431 | 1,298 | 1,513
Long-term Debt, Fair Value | [2] | 119 | 6,100 | 11,186
Liabilities at Fair Value |  | 167 | 6,121 | 11,221
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | [3] | 36 | 72 | 153
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | [3] | $ 48 | $ 21 | $ 35
[1] | Time deposits included in cash and cash equivalents and money market funds included in other current assets in the interim Condensed Consolidated Balance Sheets are held at amortized cost, which approximates fair value.
[2] | See Note 17 - Short-Term Borrowings, Long-Term Debt and Available Credit Facilities, for information on fair value measurements of long-term debt.
[3] | See Note 22 - Financial Instruments for the classification of derivatives in the interim Condensed Consolidated Balance Sheets.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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